99 lines
3.1 KiB
C++
99 lines
3.1 KiB
C++
// safer.h - originally written and placed in the public domain by Wei Dai
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/// \file safer.h
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/// \brief Classes for the SAFER and SAFER-K block ciphers
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#ifndef CRYPTOPP_SAFER_H
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#define CRYPTOPP_SAFER_H
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#include "seckey.h"
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#include "secblock.h"
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NAMESPACE_BEGIN(CryptoPP)
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/// \brief SAFER block cipher
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class SAFER
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{
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public:
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/// \brief SAFER block cipher default operation
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class CRYPTOPP_NO_VTABLE Base : public BlockCipher
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{
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public:
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unsigned int OptimalDataAlignment() const {return 1;}
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void UncheckedSetKey(const byte *userkey, unsigned int length, const NameValuePairs ¶ms);
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protected:
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virtual bool Strengthened() const =0;
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SecByteBlock keySchedule;
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static const byte exp_tab[256];
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static const byte log_tab[256];
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};
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/// \brief SAFER block cipher encryption operation
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class CRYPTOPP_NO_VTABLE Enc : public Base
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{
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public:
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void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
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};
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/// \brief SAFER block cipher decryption operation
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class CRYPTOPP_NO_VTABLE Dec : public Base
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{
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public:
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void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
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};
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};
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/// \brief SAFER block cipher default implementation
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/// \tparam BASE SAFER::Enc or SAFER::Dec derived base class
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/// \tparam INFO SAFER_Info derived class
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/// \tparam STR flag indicating a strengthened implementation
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/// \details SAFER-K is not strengthened; while SAFER-SK is strengthened.
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template <class BASE, class INFO, bool STR>
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class CRYPTOPP_NO_VTABLE SAFER_Impl : public BlockCipherImpl<INFO, BASE>
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{
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protected:
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bool Strengthened() const {return STR;}
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};
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/// \brief SAFER-K block cipher information
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struct SAFER_K_Info : public FixedBlockSize<8>, public VariableKeyLength<16, 8, 16, 8>, public VariableRounds<10, 1, 13>
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{
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CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "SAFER-K";}
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};
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/// \brief SAFER-K block cipher
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/// \sa <a href="http://www.cryptopp.com/wiki/SAFER-K">SAFER-K</a>
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class SAFER_K : public SAFER_K_Info, public SAFER, public BlockCipherDocumentation
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{
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public:
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typedef BlockCipherFinal<ENCRYPTION, SAFER_Impl<Enc, SAFER_K_Info, false> > Encryption;
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typedef BlockCipherFinal<DECRYPTION, SAFER_Impl<Dec, SAFER_K_Info, false> > Decryption;
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};
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/// \brief SAFER-SK block cipher information
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struct SAFER_SK_Info : public FixedBlockSize<8>, public VariableKeyLength<16, 8, 16, 8>, public VariableRounds<10, 1, 13>
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{
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CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "SAFER-SK";}
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};
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/// \brief SAFER-SK block cipher
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/// \sa <a href="http://www.cryptopp.com/wiki/SAFER-SK">SAFER-SK</a>
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class SAFER_SK : public SAFER_SK_Info, public SAFER, public BlockCipherDocumentation
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{
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public:
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typedef BlockCipherFinal<ENCRYPTION, SAFER_Impl<Enc, SAFER_SK_Info, true> > Encryption;
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typedef BlockCipherFinal<DECRYPTION, SAFER_Impl<Dec, SAFER_SK_Info, true> > Decryption;
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};
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typedef SAFER_K::Encryption SAFER_K_Encryption;
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typedef SAFER_K::Decryption SAFER_K_Decryption;
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typedef SAFER_SK::Encryption SAFER_SK_Encryption;
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typedef SAFER_SK::Decryption SAFER_SK_Decryption;
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NAMESPACE_END
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#endif
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